The world’s highest highway tunnel through

After more than 3 years of hard work, such as the Railway Bureau of the group and other units of builders, the world’s highest elevation of the road tunnel – long pull mountain tunnel, 25, successfully through the fourteen.

since November 2011 began, the fourteen bureau group of builders to overcome the high altitude permafrost tunnel through the fault fracture zone, concrete quality control of a number of technical problems with extremely cold temperatures.

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